Patent GB-952912-A (GB)
Title: Printer slotter adjusting mechanism
IPC: B31B50/22
Filed: 1961-09-12
Abstract: 952,912. Slotting apparatus. SAMUEL M. LANGSTON CO. Sept. 12, 1961 [July 7, 1961], No. 32734/61. Heading. B4B. [Also in Division B6] A slotter-creaser-trimmer mechanism for paper carton blanks includes mechanism for adjusting the tools longitudinally of the blanks, comprising two pairs of yokes, a pair of fixed feed screw members passing therethrough and each having a threaded portion and a hinged portion, each threaded portion opposing the hinged portion of the other screw and extending to the plane of a fixed locus, the yoke of each pair nearer to said locus being mounted on the threaded portion of its respective screw, the other two yokes having a gear means hinged to the hinged portion of the screw passing therethrough and meshed with a geared nut on the threaded portion of the other screw, and means to rotate the screws so that when one screw rotates, the nut thereon is held angularly stationary by its meshing gear, while the gear thereon operates its meshing nut to cause the outer yokes and one of the inner yokes yokes to move with respect to said locus. Paper blanks for forming cartons are passed through a plurality of printing stations and the printed blanks are then fed between upper and lower feed assemblies 34, 36, Fig. 5, each comprising two tool drive shafts 54, Figs. 5 and 17, and a rotatable shaft 52. Each shaft 54 carries one fixed head 84 and slidably but hinged for rotation with the shaft three further heads 84, to all of which heads are secured creasing and slotting blades, each shaft 52 also carrying a head 84 having a trimming blade. Each assembly further comprises two guide rods 50 on which are slidably carried three yokes 56 to each of which are secured two bifurcated guide fingers 66 having eccentrically mounted hardened steel wear buttons 90, engaging a collar 88 on the corresponding head 84. The upper assembly rods 50 also carry a trim yoke assembly 70 which has a finger similarly engaging the heads 84 on the shafts 52. The fingers 66 of each assembly carry war plates 68 engaging a collared pull roll 53 on the shaft 52. In each assembly, the yokes are moved along the rods, thus adjusting the blades axially, by means of feed screws 38, 40, driven by electric motors, the two screws 38 being synchronized by a chain drive, and the screws 40 similarly synchronized. The engagement between the screws and the yokes is such that rotation of the screws 38 moves the heads 84 shown as A and B in one direction and the head E in the opposite direction, thus simultaneously modifying the side panels III, IV, of a carton blank 112, while rotation of the screws 40 moves the heads D and E in one direction and the head A in the opposite direction, thus simultaneously modifying the end panels I, II. Simultaneous rotation, by an equal amount, of the screws 38, 40, in panel-increasing direction produces a blank for a larger carton of the same ratio of width to depth. The right hand heads 84 perform a flapcutting operation on the blank. Each screw 38, 40 comprises a plain and a threaded half. The halves 98, 96 of the screws 38 are connected by a coupling 100 which can be disconnected to allow relative rotational adjustment of the halves, for altering certain tolerances set into the machine to allow for fold radii.